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If you intend to keep using that lower with your carbine upper, know this - the carbine length gas system runs at around twice the pressure of a rifle length gas system. Don't put the carbine upper on there with a rifle buffer tube/buffer/spring.
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ABSOLUTE NONSENSE. The Rifle buffer is infinitely better with a carbine upper. The Carbine buffer system is a compromise to get the size down, and has historically been MUCH more problematic than the rifle buffer system.
In fact one of the Sheriff's Office instructors had his old SWAT entry gun set up with a 10.3" upper on a DRMO M16 lower with the rifle buffer. SBRs really gain smoothness in operation from a rifle buffer system.
If you want a sweet running carbine, get the rifle buffer system. And now with VLTOR's A5 stock, we can have the best of both worlds. A collapsible stock with a rifle buffer spring and shorter Rifle weight buffer.
Also, the the carbine gas system does NOT run "at around twice the pressure". It runs at a higher port pressure, but it's not twice the amount.